JPH0516819A - Interlocking switch attaching device for tractor - Google Patents

Abstract

PURPOSE:To facilitate attachment and removal of a sensor, an interlocking switch and so on disposed near a steering post 1. CONSTITUTION:A steering handle 2 on a steering post 1 or an interlocking switch 4 turned on and off by operating an operating lever 3 are mounted in a rubber boot 6 where the outside periphery of a steering shaft 5 is covered and fitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor interlocking switch mounting device, and an interlocking switch for interlocking with other devices or appliances by interlocking with a steering wheel or an operating lever provided around the steering wheel. Is easy to install.

[0002]

2. Description of the Related Art A front wheel speed increasing switch for detecting a turning angle of a steering wheel to increase a transmission ratio of front wheels and an operation lever are operated to a reverse position. A backup switch or the like for turning on the work device connected to the rear part of the vehicle body to the non-working position by being turned on by the vehicle is generally provided near the mounting base of these steering handles and operating levers. It was provided inside. For this reason, the work of attaching and adjusting these switches or sensors is complicated because the dashboard must be attached and detached.

[0003]

According to the present invention, an interlock switch 4 is turned on and off by operating a steering wheel 2 on a steering post 1 or an operating lever 3.
Is a structure of a tractor interlocking switch mounting device provided in a rubber boot 6 which covers and fits the outer periphery of the steering shaft 5.

[0004]

The rubber boot 6 which is covered and fitted on the outer periphery of the steering shaft 5 at the upper portion of the steering post 1 can be easily peeled off or removed due to its elasticity, and can be directly attached to the lower dashboard. The inside can be opened independently regardless of. Since the interlocking switch 4 is provided in the portion covered with the rubber boot 6, the interlocking switch 4 can be easily and easily attached / detached or adjusted by peeling or removing the rubber boot 6. it can.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A clutch housing 7 is connected to the rear side of an engine, and a transmission case is connected to the rear side of the clutch housing 7 to link rear wheels. The cylindrical steering post 1 that rotatably supports the steering shaft 5 is provided above the clutch housing 7 and above the dashboard 9 that is erected on the vehicle body frame 8. Reference numeral 10 is a floor, and 11 is a hood that covers the upper part of the engine.

Reference numeral 12 is a fuel tank, which constitutes a part of a partition wall between the engine room under the hood 11 and the control section on the floor 10 below the dashboard 9 and is located behind the fuel tank 12. The steering post 1 is positioned in the recess 13 by recessing the side, and the steering post 1 is attached to the bracket 14 mounted above the recess 13.
The fixture 15 fixed to the outer periphery of the is supported by being attached.

The lower end of the steering shaft 5 is interlocked with the power steering through the universal joint 16 to steer the front wheels. The steering post 1 projects upward from the upper end surface of the dashboard 9, and the projecting portion is covered with a bellows-like elastic rubber boot 6, and the lower end edge of the rubber boot 6 is fitted onto the upper surface of the dashboard 9. They are locked together. Further, the rubber boot 6 is fitted on the outer peripheral surface of the steering post 5 with the upper end edge having a small diameter.

On the outer periphery of the upper portion of the steering post 1, there is a bracket 17, and a steering switch 18 is attached as an interlocking switch 4 for detecting the turning angle of the steering shaft 5 and turning it on. The steering switch 18 faces a cam 19 protruding from an axial elongated hole 20 formed in a part of the steering post 1, and the cam 1
It is configured to be turned on and off by the movement of 9 in the axial direction. A screw portion 21 is formed on the steering shaft 5, a cam cylinder 22 having the cam 19 is screwed into the steering shaft 5, and the cam 19 is fitted into the long hole of the steering post 1.
By rotating the steering shaft 5 forward and backward, the cam 19
Is moved in the axial direction and the steering switch 18 is turned ON and OF
It is set to F. When the steering handle 2 is in the straight-ahead position, the steering switch 18 is OFF, and when the steering handle 2 is normally or reversely rotated to a constant steering angle, the cam barrel 22 is moved up and down and pushed by the cam 19 to turn the steering switch ON. Become. When the steering switch is turned on, the front wheel speed increasing device for increasing the speed of the front wheels is switched.

A reverse lever 23, which is one of the operation levers 4, is provided on one side of the steering post 1 so as to be pivotable forward and backward. By operating the reverse lever 23 to a reverse position R, The backup switch 24, which is one of the interlocking switches 4, is turned on to raise the working device connected to the rear part of the vehicle body to the height of the non-working position. Bracket 17 integrated with the steering post 1
The rotating shaft 25 is rotatably supported by the rotary lever 25, and the reverse lever 23 is connected to the upper end of the rotating shaft 25 by a connecting collar 26. Further, the rotating shaft 25 is interlocked with the forward / reverse switching device of the transmission case via the link mechanism 27, and when the reverse lever 23 is set to the neutral position N, the traveling transmission device is in the transmission cutoff state and the forward movement position. When set to F, the vehicle is in forward transmission.

A backup switch 24 is attached to the bracket 17. This backup switch 2
Reference numeral 4 activates a solenoid valve in a hydraulic circuit of a lift arm that raises and lowers the work device to raise the lift arm that has been lowered to the work position to a non-work position. The operation lever 2 is provided with a throttle lever 27, a lift lever 28 for raising the lift arm, and the like. Of these, the throttle lever 27 is attached to the bracket 17 so as to be rotatable back and forth, and similarly to the reverse lever 23, the throttle lever 27 is projected outward from a long hole provided at an upper position of the rubber boot 6 to rotate. The axial center positions are both inside the rubber boot 6. The lift lever 28 projects outward from the rubber boot 6 at a position higher than the projecting positions of the reverse lever 23, the throttle lever 27, and the like. The lift lever 28 moves up and down to turn on and off.
A lift switch 29 that is turned on is attached to the steering post 1 as one of the interlocking switches 4.

[Brief description of drawings]

 The figure shows an embodiment of the invention.

FIG. 1 is a rear view of a main part.

FIG. 2 is a plan view thereof.

FIG. 3 is a side view thereof.

FIG. 4 is a partial side view.

FIG. 5 is a partial side sectional view.

[Explanation of symbols]

 1 Steering post 2 Steering handle 3 Operating lever 4 Interlocking switch 5 Steering shaft 6 Rubber boots

Claims (1)

Claims: 1. The steering wheel 2 on the steering post 1 is turned on or off by operating the operating lever 3.
An interlocking switch mounting device for a tractor, in which a FF interlocking switch 4 is provided in a rubber boot 6 that covers and fits the outer periphery of the steering shaft 5.